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Re: st: reporting results from a multiple imputed data set

From   Joerg Luedicke <[email protected]>
To   [email protected]
Subject   Re: st: reporting results from a multiple imputed data set
Date   Wed, 20 Apr 2011 10:47:19 -0400

On Wed, Apr 20, 2011 at 9:52 AM, Lamla, Bettina
<[email protected]> wrote:
> Hi Joerg!
> Well, regarding
> (1) i can only include  M-1 year dummies.
> If my command includes M year dummies anyway, stata will omit one dummy due to collinearity, i.e. the least significant one.
> (2) the least significant one varies across imputations. Hence I could just exclude let's say year 1 for all estimations and hence cannot report an estimate for this year
>  OR
> I let stata pick the year dummy to be excluded and as a result -after applying the rubin rule- have estimates for all M year dummies even though this would not be possible in the individual regressions

So what you mean is that your reference category is a different one in
each of the M regressions? I still do not understand that. If you put
all your dummies in the model, I would think Stata omits the last one
entered, but not the least significant one ("Significant" with regard
to what, anyway? With regard to differences of all permutations; vs.
the rest of the field?) As Maarten said, just pick the reference
category that makes the most sense in your context.


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